Basilika Maria Dreieichen, Baroque parish church in Rosenburg-Mold, Austria.

Basilika Maria Dreieichen is a baroque pilgrimage and parish church set on a hill above the Horn Valley in Rosenburg-Mold, Lower Austria. It has two towers that stand out over the valley, and the interior features altars, frescoes, and stucco work typical of the baroque period.

A stone chapel was built on the site of the old devotional image from 1730 to 1733 and consecrated to Maria Dreieichen in 1735, giving the hamlet its name from 1737. The present church followed from 1744 to 1750, a cruciform building with a long oval central dome invisible from outside, built under Abbot Placidus Much to plans by Leopold Wißgrill modelled on the Altenburg abbey church; the choir was added in 1760. The towers were completed in modified form by Karl Benedikter between 1814 and 1819. Pope Pius XII raised the church to minor basilica in March 1957.

The name of the site refers to three oak trees that once stood on this hill and are said to have sparked Marian devotion here. Pilgrims from across the region still come on foot to pray at the church, keeping a living tradition on the hillside.

The church sits on a hill and can be reached on foot or by car along a side road. Visiting on a quiet weekday gives more space to move around inside and take in the details without crowds.

North of the church, in the forest, stands the Bründlkapelle, a small chapel with a barrel vault and a rounded apse. Inside, a relief cartouche shows the Maria Dreieichen image from around 1750. In 1983 the painter Herbert Puschnik made the gable graffito and the Stations of the Cross along the Bründlweg. A nearby cave is linked in folk tales to the robber Johann Georg Grasel (1790–1818), though no historical records confirm it.